A biaxial test specimen for crack arrest studies |
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| Authors: | M Kosai A Shimamoto C -T Yu A S Kobayashi P Tan |
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| Institution: | (1) Department of Mechanical Engineering, University of Washington, 98195 Seattle, WA;(2) Department of Mechanical Engineering, Saitama Institute of Technology, 1690 Okabe, Saitama, Japan;(3) Department of Mechanical Enineering, University of Washington, Box 352600, 98195-2600 Seattle, WA;(4) Department of Mechanical Enineering, University of Washington, Box 352600, 98195-2600 Seattle, WA;(5) Technical Center, Federal Aviation Administration, Atlantic City International Airport, 08405, NJ |
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| Abstract: | A biaxially loaded, single edge notched (SEN) fracture specimen, with mixed modes I and II loading, was used to study the
crack arrest capability of a bonded and riveted tear strap without and with simulated multiple site damage (MSD). MSD was
modeled by a 50-percent groove without which the running crack would inevitably kink due to KII loading. A total of thirty-one 2024-T3 aluminum specimens with various crack and MSD configurations were tested. The fracture
parameters associated with straight and curved crack paths were determined by using the experimenta results to drive a dynamic
finite element model of the specimen in its generation mode. The crack kinking and extension criteria were verified by the
excellent agreement between the prediction based on these fracture parameters and the measured crack kinking angles. Comparison
between the test results generated by the biaxial stress specimens and by those generated by small- and full-scale pressurized
fuselage rupture experiments showed that this specimen can be used to prescreen the effectiveness of tear straps and crack
arrestors in an airplane fuselage. |
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